Coolmax - comfort meets mile after mile durability in a hiking sock that refuses to quit. Coolmax synthetic yarns move moisture away from your skin and deliver fast drying comfort. Cushioning along the bottom of the foot provide the perfect amount of support while a smooth, performance fit assures there's no slipping, no bunching, and no blisters. Supremely comfortable, breathable and fast drying. Still made in Vermont. Guaranteed for life.